It's not a key it's a Fob and you my friend have a programming problem. Return to the dealership for the fix. You're not the first.
ORIGINAL: BkChallenger09R/T
I love my new Challenger 6 speed R/T . But what where they thinking when they designed this peg they call a key. And the button's on it set off the alarm , open the trunk with it in my pocket walking around in the house. And I have even had the trunk lid open after starting the car from hitting the button . I may have to have a leather cover made to keep from hitting the button's .